== sanity test 101b: check stride-io mode read-ahead =========================================================================== 09:25:01 (1782221101)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.731960s, 4.84342MB/s
Read-ahead success for size 8192

2.370636s, 3.53855MB/s
Read-ahead success for size 16384

2.495262s, 3.36181MB/s
Read-ahead success for size 32768

2.116133s, 3.96412MB/s
Read-ahead success for size 65536

2.174782s, 3.85722MB/s
Read-ahead success for size 131072

2.015367s, 4.16232MB/s
Read-ahead success for size 262144

1.519352s, 5.52117MB/s
Read-ahead success for size 524288

1.396028s, 6.00891MB/s
Read-ahead success for size 1048576